The shift function takes one list as the argument. The function removes the first element from
the list and returns the list again. A combination of listFirst and shift can be used to get
a different values from a list.
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(define l1 (list 1 2 3 4 5))
(display "List: ")
(write l1)
(display "List Post-Shift: ")
(write (shift l1))

